The present application is directed to a banknote centering mechanism and in particular, to an improved drive arrangement for the banknote centering mechanism.
Our earlier U.S. Pat. No. 6,149,150 discloses a banknote centering mechanism having a banknote slot of a size for receiving banknotes of different widths and allowing the banknotes to pass through the slot to a banknote centering mechanism. The banknote centering mechanism has a pair of opposed side engaging members which are movable towards one another and allow centering of the banknote between the two side members. The drive arrangement for moving the banknote from the banknote slot to the centering mechanism effectively releases the banknote within the centering mechanism allowing the banknote to float and thereafter be centered by the side engaging members.
The side engaging members are driven by a common drive arrangement which moves the side engaging members together until such time as the banknote is centered and effectively opposes further inward movement of the side engaging members. This creates a stall condition and thus banknotes of different widths can be effectively centered.
Also disclosed in our earlier patent is the use of a worm drive arrangement for moving of the side members towards one another, as well as a particular sequence for assessing the amount of power necessary for centering a banknote effectively. This sequence includes cycling of the side members towards one another to access changing frictional forces which may occur in the banknote centering mechanism from time to time. With this measure as a base, the additional power for centering is set.
The present invention provides an improved drive arrangement for the side engaging members of the centering mechanism where the drive arrangement includes a rack and pinion power transfer mechanism for controlling the position of the side engaging members. This drive arrangement provides an effective power transfer mechanism and provides improved control of the side engaging members. Improved precision in setting the power for centering or assessing the stall condition is realized as there is less variation in the power transfer due to the rack and pinion drive arrangement.
Preferred embodiments of the invention are shown in the drawings, wherein:
As shown in our earlier patent, a banknote centering mechanism is provided in front of a banknote validator to effectively center the banknote for processing by the validator. The banknote centering mechanism provides advantages with respect to the validator, particularly in countries or regions where the currency provided to the device is of different widths. By effectively centering each banknote prior to processing by the validator, the evaluation of the authenticity of the banknote is greatly simplified. Furthermore, precision in locating of the center line of the banknote also allows improvements in the processing of the data and/or reduced processing time.
The banknote centering mechanism 2 includes opposed side members 4 and 6 which move towards one another in a controlled manner determined by the centering banknote drive 8. Each of the side members 4 and 6 includes a rack gear 14 and 16 respectively which cooperates with the spur gear 12 of the centering banknote drive 8. The spur gear 12 is driven by the motor 10.
Each of the opposed side members 4 and 6 are slidable along guide shafts 21 and 23 to allow the movement of the side engaging members towards or away from one another, controlled by the centering banknote drive 8. This banknote centering mechanism works in a similar manner to our earlier U.S. Pat. No. 6,149,150 with the centering banknote drive 8 replacing the former worm gear drive. Various shaft arrangements for controlling sliding of the side members can be used. It has been found that the spur gear and rack drive arrangement provides excellent control and movement of the side engaging members towards one another. This allows accurate coordination of the stall condition with the buckling force provided by a banknote as it is centered by the side engaging members. Also this drive arrangement is quite cost effective. The spur gear and rack drive arrangement tends to have less variation and lower friction over time relative to our earlier worm drive arrangement. The worm drive arrangement can develop a high static torque necessary to initially move the side members 4 and 6. Dirt, wear and other contaminates can cause significant variations making it more difficult to adjust over time. The rack and pinion drive is more tolerant.
In a preferred embodiment a stepper motor is used to provide additional control. The drive cycle can include higher initial power to initially move the side members followed by a reduction in power to provide good control of the stall condition. This arrangement and the rack and pinion drive arrangement in general, provides better control over time and is more toleration with respect to wear and contamination.
As disclosed in our earlier application, motor 10 is a low torque motor or stepper motor that can be controlled in a manner to vary the stall condition. Typically the centering mechanism will go through a number of cycles to assess the general condition of the centering mechanism without a banknote present to form the basis for setting of the motor parameters to produce the desired stall condition created by the resistance of the banknote when centered. In the example of a stepper motor the power can be initially higher to initiate movement of the side members 4 and 6 and then reduced to a level appropriate for stalling the motor when a banknote is centered.
The triangular roller includes a number of sensing positions to allow determination of when a banknote is not effectively engaged by the roller. This condition allows for centering of the banknote as the banknote is free to move and be centered by the side engaging members.
The banknote drive 20 effectively allows movement of the banknote to the centering position releasing of the banknote to allow centering and the subsequent re-engagement and movement of the banknote out of the centering mechanism. Other drive arrangements for releasing of the banknote between the side engaging members are possible.
The alternate banknote centering mechanism 102 shown in
Each of the opposed side members 104 and 106 are slideable along guide shafts 121 and 123 to allow movement of the sliding engaging members towards or away from one another on a control by the centering banknote drive 108.
The embodiments shown in
As can be appreciated from the bottom view of
The motor 110 of the drive arrangement 108 includes two outwardly extending flanges that include securing ports for securing the motor drive 8 to the table support 103. This securement is accomplished by these flanges in combination with the screws 161 and 163. As shown in the sectional view of
The central table support 103 as shown in
Once the banknote has been centered, the drive of the banknote is resumed and it is processed by the banknote validator 203 as the banknote passes through the validator. If the banknote is accepted, it is passed out of the slot 217 shown in
The sectional view of
It has been found that a banknote centering with the side members driven in a coordinated manner by means of the two rack members in a common spur gear provides excellent control on the banknote centering mechanism and it is more consistent with respect to the operating characteristics thereof over time than the worm drive arrangement of our earlier structure. This rack and pinion drive arrangement is more tolerant with respect to changing operating conditions and in particular due to changing operating conditions over time.
Although various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
Number | Date | Country | Kind |
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2,587,168 | May 2007 | CA | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/CA2008/000855 | 5/5/2008 | WO | 00 | 6/17/2010 |